That's pretty cynical. My wife makes almost as much as I do (maybe more with bonuses), she probably spends as much money on me as I do on her. Not going to go into details about my sex life but it's very satisfactory. I do BJJ 4 times a week, more than that if I'm gearing up for a tournament, and she's cool with it. I just make sure that when I'm not doing BJJ that I spend time with her. She knows it's very important to me, and if we have something she really wants to do then I skip a class or two...but that's not very often, because again she knows it's a priority of mine.
Maybe you just need a girlfriend who cares about your priorities and doesn't suck in bed. Not that that is necessarily easy to find, but I wouldn't assume that a girlfriend/wife destroys your BJJ. I don't imagine most top competitors are celibate warrior priests.
2 major differences between a girlfriend and a wife. A wife is somebody who you plan to be with the rest if your life, a girlfriend is somebody you just fuck while you decide if this is the piece of meat you want to chew on the rest of your life; you wait to see if you can develop feelings for the broad.
Girlfriends these days are made for sex only, and the ones you need to take seriously don't stay with you during the hard times. Hence why the other poster is saying that you should never prioritize a girlfriend over a lifestyle, and I agree with him.